According to LiveScience:
How many early human species existed on Earth?
How many early human species existed on Earth? | Live Science
Kind of implies something...Really, if so, isn't the more interesting question, "How many early human species existed OFF Earth?"
How many early human species existed on Earth?
How many early human species existed on Earth? | Live Science
Kind of implies something...Really, if so, isn't the more interesting question, "How many early human species existed OFF Earth?"